272 DEEP-SEA FISHES OF THE ATLANTIC BASIN. 



and mandible; vomer and palate toothless. Preoperculum armed with short, stout, simple 

 spines. Bones of the skull thiu. Gills 3J; no slit behind the last. Gill openings wide; 

 the membranes broadly attached to the isthmus. Gill rakers tubercular, in moderate 

 number. Spinous dorsal low, separated by a deep notch from the soft dorsal. Pectorals 

 procurrent in front. Ventrals small; caudal rounded. Vent distant from the anal origin. 

 Head and body naked. Lateral line consisting of a series of large pores. 



This genus is represented by seven examples of the type species, M. zonunis, Bean, 

 taken by the Albatross on August 9, 18S8, from station 2853, off Trinity Islands, in 56° 

 N. lat., 154^ W. Ion., at a depth of 159 fathoms. 



Family CYCLOPTERID^E. 



Cyclopteridw, Bonaparte, Cat. Metodico, 1846. 64. — Gill, Arr. Families of Fishes, 1872, xxx ; Century Dic- 

 tionary, 1434. — Jordan and Gilbert, Bull, xvi, u. S. Nat. Mus., 744. — Gill, Proc. 1 T . S. Nat. Mus.,xin, 

 366, 1891. 



Cyelopterina, Gcntiier, Cat. Fish. Brit. Mus., Ill, 154. 



Cyclopteroidea, with a feebly ossified skeleton and ventricose body, covered with thick 

 skin, which maybe either smooth, tubercular, or spinous. Head short, thick; suborbital 

 stay present, thin and flattish. Mouth small, terminal; jaws lateral, with slender teeth in 

 bands; vomer and palatines toothless. Gill openings narrow, membranes broadly joined 

 to isthmus and shoulder girdle. Branchiostegals 6\ Dorsal fin long, its anterior portion 

 of flexible spines, sometimes hidden in adult by a fleshy hump, sometimes wanting. Soft 

 dorsal small, opposite and similar to anal. Caudal rounded. Ventral rudimentary, form- 

 ing the bony center of a thoracic sucking disk. Pectorals short, low, with bases broad and 

 procurrent. Pyloric creca numerous. Vertebrae 1l'-(-16. 



KEY TO THE GENERA OF CYCLOPTERIDW. 

 (From Jordan and Gilbert, rearranged. | 



I. Spinous dorsal present, sometimes disappearing with age; skin tubcreulate. 



A. Dorsal spines in adult hidden in a ileshy bump. Ventral disk small C yci.optercs 



B. Dorsal spines not bidden in adult; gill opening a small slit; ventral disk large EUMICROTREMUS 



II. Spinous dorsal wanting; skin smootn or nearly 30 [Cycloptekk hthys] 



Genus EUMICROTREMUS, Gill. 



Eumierotremus, Gill, Proc. Acad. Nat. Sci., Phila., 1864, 190.— Collett, Norsk. Nordb. Exp., 67.— Goode 

 and Bean, Bull. Essex Inst, xi, 12. — Jordan and Gilbert, Bull, xvi, U. S. Nat. Mus., 957. 



Cyclopterids with a spinous dorsal, which is sometimes in adults hidden in the skin, 

 though never disappearing with age. Skin thick, armed with series of bony tubercles. 

 Gfll opening a small slit on level of eye. Ventral disk large. 



EUMICROTREMUS SPINOSUS, (Miller), Gill. (Figure 250.) 



Cyclopterus spinosus, MCller, Prodromus Zoologiie Danice, 1777, IX.— Gaimard, Voy. Skand., Poiss., 

 pi. iv, fig. 2— GOnther, Cat. Fish. Brit. Mus., in, 1861, 157; Proc. Zool. Soc, London, 1877, 293, 

 fig. (young); ibid., 475; Challenger Report, xxil, 1887, 66.— Malmgren, Ofvers. K. Vet. Ak. Forh., 

 1864,489, sp. 6.— Frisch, Peterm. Geogr. Mittb. 1865, Erg. Heft. Nr. 16, 35.— HEUGLIN, Fauna ami Flora 

 in Geologic Spitzbergen in Novaja Semlja, 1874, 211.— Jordan and Gilbert, BuU. xvi, U. S. N. M., 746. 



Lumpus spinosus, Storer, Syn. Fish. N. A., 1846, 230. 



Eumierotremus spinosus, Gill, Proc. Acad. Nat. Sci., Phila., 1864, 190. — Collett. Norske Nordh. Exped., 



Fisk., 67, pi. ii, fig. 13.— Goode and Bean, Bull. Essex Inst., xi, 12.— Jordan and Gilbert, Bull, xvi, 



U. S. N. M., 957.— Jordan, Cat. Fish. N. A., 116. 



Body orbicular, cuboid anteriorly, its height nearly one-half of its length, which is 3 

 times the length of the head; base of spinous dorsal and body behind vent abruptly com- 

 pressed; teeth in narrow bauds; gill openings on a level with eye. slightly narrower than 

 orbit. Spinous dorsal not hidden, covered with rough tubercles, similar to those on body, 

 but smaller; width of ventral disk slightly less than its length, and somewhat less than 



